Isaiah 20:3-4

3Then the LORD said, “Just as my servant Isaiah has gone stripped and barefoot for three years, as a sign and portent against Egypt and Cush, That is, the upper Nile region; also in verse 5 4so the king of Assyria will lead away stripped and barefoot the Egyptian captives and Cushite exiles, young and old, with buttocks bared—to Egypt’s shame.